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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
There are actually 60 minerals, 16 vitamins, 12 essential amino acids, and three essential fatty acids that your body needs every day.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.